[pmg-devel] [PATCH docs] Update minimal and recommended system requirements

[Alwin Antreich]

On Wed, Mar 13, 2019 at 07:12:12AM +0100, Thomas Lamprecht wrote:
> On 3/12/19 4:09 PM, Alwin Antreich wrote:
> > On Tue, Mar 12, 2019 at 09:41:36AM +0100, Thomas Lamprecht wrote:
> >> On 3/7/19 3:23 PM, Alwin Antreich wrote:
> [snip]
> >>>  
> >>> -* Hardware RAID1 or RAID10, Raid Controllers need write cache with
> >>> -  batteries backup module for best performance
> >>> +* 1 Gbps ethernet network interface card
> >>>  
> >>> -* Enterprise class SSD with power loss protection (e.g. Intel SSD DC
> >>> -  35xx/36xx/37xx)
> >>> +* Storage: at least 8 GB free disk space, best with RAID1 or RAID10, +
> >>> +  use hardware RAID controller with battery backed write cache (``BBU'') or
> >>> +  non-RAID with ZFS and SSD cache (optional). ZFS is not compatible with a
> >>
> >> non-RAID sounds strange if you then can select only modes starting with "RAID..."
> >> in the installer for  ZFS. Also are we sure that we want to say "best with HW
> >> raid" as I have the slight experience that HW raids often are not really "the best"
> >> Maybe, "best with redundancy" then shortly mention the possibilities (ZFS, HW RAID)?
> >>
> > The wording 'non-RAID' is used to identify disks not in RAID modes.
> 
> But you explicitly write "ZFS is not compatible with a hardware RAID controller"
> so this should be clear already.
> 
> Also, that's what you mean and is technically correct, but not what a (new) user may
> know, especially if then "zfs (RAID01)", "zfs (RAID1)", ... is written in the
> installer, you see the confusion possibility?
> 
> IMO, this should be short and clear, so what do you want to tell the user, I'd
> guess that redundancy is "recommended", so writing that should be correct, examples
> about what technology to use to achieve that can be then given shortly, but the
> point you want to convey is "redundancy" not the use of a specific tech, as if
> installed in a virtual environment all two listed are void anyway - you do not
> want to suggest that an user adds two disks to the PMG hosted VM (maybe even backed
> by the same storage) and setups a RAID-.. there :-D
I see. I'll reword the section to make it also less complex.

> 
> > Aren't you refereing with 'best with HW raid' to the removed section?
> 
> no, to the by you added one...
> 
> > 
> >>> +  hardware RAID controller. For best performance use Enterprise class SSD with
> >>> +  ower loss protection.
> >>
> >> s/ower/power/
> > Thanks for spotting.
> >